package com.fs.sw.common.jpa.repository;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.support.JpaEntityInformation;
import org.springframework.data.jpa.repository.support.JpaRepositoryFactory;
import org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean;
import org.springframework.data.jpa.repository.support.JpaRepositoryImplementation;
import org.springframework.data.repository.core.RepositoryInformation;
import org.springframework.data.repository.core.RepositoryMetadata;
import org.springframework.data.repository.core.support.RepositoryFactorySupport;
import org.springframework.util.Assert;

import javax.persistence.EntityManager;
import java.io.Serializable;

public class BaseRepositoryFactoryBean<R extends JpaRepository<T, I>, T, I extends Serializable>
		extends JpaRepositoryFactoryBean<R, T, I> {

	public BaseRepositoryFactoryBean(Class<? extends R> repositoryInterface) {
		super(repositoryInterface);
	}

	@Override
	protected RepositoryFactorySupport createRepositoryFactory(EntityManager em) {
		return new BaseRepositoryFactory(em);
	}

	private static class BaseRepositoryFactory<T, I extends Serializable> extends JpaRepositoryFactory {

		private final EntityManager em;

		public BaseRepositoryFactory(EntityManager em) {
			super(em);
			this.em = em;
		}

//		@SuppressWarnings("unchecked")
//		@Override
//		protected Object getTargetRepository(RepositoryInformation information) {
//			return new BaseRepositoryImpl<T, I>((Class<T>) information.getDomainType(), em);
//		}

		@Override
		protected JpaRepositoryImplementation<?, ?> getTargetRepository(RepositoryInformation information, EntityManager entityManager) {
			JpaEntityInformation<?, Serializable> entityInformation = this.getEntityInformation(information.getDomainType());
			Object repository = this.getTargetRepositoryViaReflection(information, new Object[]{entityInformation, entityManager});
			Assert.isInstanceOf(BaseRepositoryImpl.class, repository);
			return (JpaRepositoryImplementation)repository;
		}

		@Override
		protected Class<?> getRepositoryBaseClass(RepositoryMetadata metadata) {
			return BaseRepositoryImpl.class;
		}
	}
}
